fix(node): golangci-lint failures + broken test Dockerfile/script

[tomatoishealthy]

Summary

Small, behavior-preserving fixes for feat/sequencer-final so CI lint passes and the docker-sequencer-test harness builds/starts again. No logic changes.

Lint (golangci-lint, node module)

• errcheck: handle ignored error returns — block_fsm.go (rc.Close, sink.Cancel), ha_service.go (transport/stableStore/logStore Close), enclave_signer.go (conn.SetDeadline ×2)
• gosec G112: set ReadHeaderTimeout on the hakeeper RPC server and the node metrics HTTP server
• gosec G301: tighten raft StorageDir permissions 0o755 → 0o750
• gofmt: reformat ha_service.go, signer.go, verifier.go
• misspell: initialised→initialized, initialises→initializes, cancelled→canceled

Build / test harness

• Drop the dead COPY ./morph/oracle/go.mod step from the l2-node and tx-submitter test Dockerfiles — the oracle project no longer exists on this branch, so the COPY fails the image build.
• run-test.sh: fix a non-existent compose service name (sentry-geth-0 → sentry-el-0) that aborted L2 startup under set -e.

Test plan

• go run ../build/lint.go from node/ → exit 0 (was 18 errors)
• run-test.sh build → both test images build cleanly (oracle COPY removed)
• run-test.sh setup + start → 4-node L2 + sentry come up; PBFT→V2 upgrade at height 10; cluster produces blocks and stays hash-consistent
• Swapped one node to the rebuilt image → applies V2 blocks, hash-consistent with the rest of the cluster

[coderabbitai]

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